Chapter 1. Product Description
EK–SMCPP–UG. A01
1–25
1.8
Redundant (4 + 4) Power Configuration
A full redundant power configuration requires two separate power sources, two
ac power controllers, and eight shelf power supplies (Figure 1-15). DIGITAL
recommends this configuration to provide complete power system redundancy
thereby ensuring complete data protection. Any one of the following error
conditions will cause the subsystem to cease operation:
•
Failure of five power supply SBBs
•
Failure of both power entry controllers
•
Failure of the ac power source
•
Failure of both PDUs (ESA10000 only)
The primary ac source provides power to controller A, which distributes the ac
power through the four black power cords to the four power supply SBBs on the
left end of each shelf.
The second, or redundant, ac source provides power to controller B. The four
power supply SBBs on the right end of each shelf are connected to power bus B
with the four gray power cords.
Figure 1–15 Redundant Power Configuration (4 + 4)
